JP2011148275A - Method for manufacturing compressed wood product, and compressed wood product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide appropriate strength after forming without generating any cracks during formation of a box-shaped blank having an opening. <P>SOLUTION: The method for manufacturing a compressed wood product includes: the blank forming step of forming a blank formed into a box shape having a flat main plate part having a roughly rectangular main surface and a side plate part curved obliquely to the main plate part from the peripheral edge of the main plate part to extend and having a round opening end surface, where the fiber direction of wood is roughly parallel to the main surface of the main plate part, and intersects roughly rectangular four sides constituting the outer edge of the main surface on the main surface; the softening step of softening the blank formed during the blank forming step; the compression step of deforming, by applying a compression force to the blank softened during the softening step, the blank into a box shape to be smaller in volume and different from that before the softening step; and the fixing step of fixing the shape of the blank deformed during the compression step, are provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a compressed wood product obtained by compression-molding wood into a predetermined three-dimensional shape, and a compressed wood product.

  In recent years, natural wood has attracted attention. Since wood has various grain patterns, individual differences occur depending on the location of the raw wood, and the individual differences are the individuality of each product. In addition, scratches and changes in color caused by long-term use may also have a unique texture and may be familiar to the user. For these reasons, wood is attracting attention as a material that can produce unique and tasty products that are not found in products using synthetic resins and light metals, and its molding technology is also making rapid progress.

  2. Description of the Related Art Conventionally, as wood compression molding technology, a technology has been known in which a single piece of wood compressed in a softened state is temporarily fixed, and this wood is molded and recovered to form a three-dimensional wood. (For example, refer to Patent Document 1). In this technique, first, the wood is compressed and temporarily fixed in a softened state. Thereafter, a plate material obtained by slicing the temporarily fixed wood is set in a mold, the plate material is softened again in high-pressure steam, and a bending process is performed. Subsequently, the curved member that has been subjected to the bending process is set again on the mold, softened again, and pressed by a press to obtain a final shape.

  In addition, as another compression molding technique for wood, in order to produce wood with improved dimensional stability by improving anti-swelling ability (ASE), the wood is subjected to steam heating and pressure treatment, followed by a secondary process. The technique which heat-presses the wood is known (for example, refer patent document 2). In this technology, as an example, it is described that the dimensional stability of the wood is improved by performing heat and pressure treatment on the flat wood.

  By using the compression molding technique described above, for example, a flat main plate portion whose main surface is substantially rectangular, and a side plate portion that curves and rises from the peripheral edge of the main plate portion, and has a box shape with an opening. A wooden product can be formed (see, for example, Patent Document 3). In this technique, a blank material having a volume added in advance by compression and having a box shape different from the shape after molding is compression-molded using a pair of molds.

JP-A-11-77619 Japanese Patent No. 2855139 JP-A-2005-205673

  By the way, in the case of forming a compressed wooden product having a box shape, the longitudinal direction of the main plate portion and the fiber direction of the wood are often made substantially parallel in consideration of strength. However, when the main plate portion is shaped so that the longitudinal direction of the main plate portion and the fiber direction of the wood are substantially parallel to each other, a portion of the side plate portion whose thickness direction is substantially parallel to the fiber direction of the wood is generated. In this portion, the length of the wood fibers is short, so that when the bending stress is applied in the direction of tearing the adjacent wood fibers extending at the time of compression, there is a high possibility that the crack will occur. In addition, even if no cracking occurs due to compression, there is a possibility that an appropriate strength cannot be imparted after compression due to the short fiber length of the wood.

  This invention is made | formed in view of the above, Comprising: It does not generate | occur | produce a crack at the time of shape | molding the box-shaped blank material which has an opening, The compression wooden product which can provide appropriate intensity | strength after shaping | molding An object is to provide a manufacturing method and a compressed wood product.

  In order to solve the above-described problems and achieve the object, a compressed wood product manufacturing method according to the present invention is a compressed wood product manufacturing method for manufacturing a compressed wood product having a three-dimensional shape including a curved surface by compressing wood. A flat main plate portion having a substantially rectangular main surface, and a side plate portion having an opening end surface that extends from the periphery of the main plate portion in an oblique direction with respect to the main plate portion, and has an open end surface that circulates. A blank material is formed in which the fiber direction of the wood is substantially parallel to the main surface of the main plate portion and intersects substantially four sides of the main surface on the outer surface of the main surface. The blank material forming step, the softening step for softening the blank material formed in the blank material forming step, and applying a compressive force to the blank material softened in the softening step, the volume is smaller than the blank material before the softening step One said compression step of deforming in a different box-shaped softening step before the blank, and having a fixed step of fixing the shape of the blank which is deformed by the compression step.

  Moreover, the manufacturing method of the compressed wood product which concerns on this invention is the angle which the fiber direction of the said wood and the substantially rectangular four sides in the main surface of the said main board part cross | intersect on the said main surface in the said invention, respectively. Is 30 degrees or more and 60 degrees or less.

  The compressed wood product manufacturing method according to the present invention is characterized in that, in the above-mentioned invention, the immobilizing step immobilizes the blank material in a steam atmosphere at a higher temperature and pressure than air.

  Further, in the method for producing a compressed wood product according to the present invention, in the above invention, the compression step is performed at a higher temperature and pressure than the atmosphere, and in the steam atmosphere at a lower temperature and lower pressure than the steam atmosphere in which the fixing step is performed. It is characterized by applying a compressive force to the material.

  The compressed wood product manufacturing method according to the present invention is characterized in that, in the above invention, the compressing step applies a compressive force by sandwiching the blank material between a pair of convex molds and a concave mold.

  The compressed wood product according to the present invention is a compressed wood product that is manufactured by compressing wood and has a three-dimensional shape including a curved surface, the main plate portion having a substantially rectangular main surface, and the main plate portion. And a side plate portion having an opening end surface that extends in an oblique direction with respect to the main plate portion from the peripheral edge of the main plate portion, and has its own fiber direction substantially the same as the main surface of the main plate portion. They are parallel to each other and intersect each of the four sides of a substantially rectangular shape that forms the outer edge of the main surface on the main surface.

  Further, in the compressed wood product according to the present invention, in the above invention, an angle at which the fiber direction and four substantially rectangular sides of the main surface of the main plate portion intersect on the main surface is 30 degrees or more and 60 degrees or less. It is characterized by that.

  Moreover, the compressed wood product according to the present invention is characterized in that, in the above-described invention, the compressed wood product is an exterior body for an electronic device that sheathes the electronic device.

  According to the present invention, a flat plate-like main plate portion having a substantially rectangular main surface, and a side plate portion having an opening end surface that extends from the peripheral edge of the main plate portion so as to bend in an oblique direction with respect to the main plate portion. A blank material in which the fiber direction of the wood is substantially parallel to the main surface of the main plate portion and intersects substantially rectangular four sides forming the outer edge of the main surface on the main surface Therefore, fibers that extend adjacently in the blank are difficult to peel off due to bending stress during compression. Therefore, cracking does not occur when a box-shaped blank having openings is compression-molded, and appropriate strength can be imparted after molding.

FIG. 1 is a flowchart showing an outline of a method for manufacturing a compressed wood product according to an embodiment of the present invention. Drawing 2 is a figure showing typically the outline of the blank material formation process of the manufacturing method of the compressed wood product concerning one embodiment of the present invention. FIG. 3 is a perspective view showing the configuration of the blank material formed by the blank material forming step of the compressed wood product manufacturing method according to the embodiment of the present invention. FIG. 4 is a schematic view seen from the direction of arrow A in FIG. FIG. 5 is a diagram schematically showing an outline of the compression step of the method for manufacturing a compressed wooden product according to one embodiment of the present invention. 6 is a cross-sectional view taken along line BB in FIG. FIG. 7 is a view showing a state in which the deformation of the blank material is almost completed in the compression step of the compressed wood product manufacturing method according to the embodiment of the present invention. FIG. 8 is a diagram schematically showing an outline of a heating shaping step of the method for manufacturing a compressed wood product according to one embodiment of the present invention. FIG. 9 schematically shows a state in which a pair of heating shaping concave molds and heating shaping convex molds are clamped in the heating shaping step of the method for manufacturing a compressed wood product according to one embodiment of the present invention. FIG. FIG. 10 is a perspective view showing a configuration of a compressed wood product according to an embodiment of the present invention. FIG. 11 is a perspective view showing a configuration of an exterior body of a digital camera which is an application example of a compressed wood product manufactured by the compressed wood product manufacturing method according to an embodiment of the present invention. FIG. 12 is a perspective view showing an external configuration of a digital camera packaged by the exterior body shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the accompanying drawings. Note that the drawings referred to in the following description are schematic, and when the same object is shown in different drawings, dimensions, scales, and the like may be different.

  FIG. 1 is a flowchart showing an outline of processing of a compressed wood product manufacturing method according to an embodiment of the present invention. In FIG. 1, a blank material is first formed (step S1). FIG. 2 is a diagram schematically showing an outline of the blank material forming step. In the blank material forming step, the blank material 2 is formed by cutting or the like from the raw wood 1 such as a solid material in an uncompressed state.

  FIG. 3 is a perspective view showing the configuration of the blank 2. 4 is a plan view in the direction of arrow A in FIG. In FIG. 4, the grain G of the blank 2 is omitted. The blank 2 is a flat main plate portion 21 having a substantially rectangular main surface, and a side plate portion having an opening end surface that extends from the periphery of the main plate portion 21 in an oblique direction with respect to the main plate portion 21 and circulates. 22 and a box shape. The fiber direction L of the blank 2 intersects each of the substantially rectangular four sides (two long sides 21a and two short sides 21b) forming the outer edge of the main surface of the main plate portion 21, and substantially the entire end surface of the side plate portion 22. It intersects with the thickness direction of the end face (for example, T1 to T4 in FIG. 4) over the circumference. The side plate portion 22 includes two first side plate portions 22a extending from each of the two long sides 21a parallel to each other, and two second side plate portions 22b extending from each of the two short sides 21b parallel to each other. Is provided. Note that the substantially rectangular shape here includes parallelograms slightly distorted from the rectangle and shapes close to a square.

In the blank material 2 having the above configuration, wood fibers are connected from the main plate portion 21 to the side plate portion 22. Further, in the blank material 2, the length of the wood fiber is longer than the thickness of the side plate portion 22 over almost the entire area of the side plate portion 22. In particular, assuming that the angle between the fiber direction L of the blank 2 and the long side 21a of the main plate portion 21 is θ ₁ and the angle between the short side 21b of the main plate portion 21 is θ ₂ , θ ₁ and θ ₂ are respectively If it is 30 degrees or more and 60 degrees or less, since the dispersion | variation in the ratio of the thickness in each part of the side-plate part 22 and the fiber length of the wood which passes through the part can be suppressed, it is more preferable.

  Next, the blank material 2 is left for a predetermined time in a high-temperature and high-pressure steam atmosphere to soften the blank material 2 (step S2). This steam atmosphere has a pressure of about 0.1 to 0.8 MPa and a temperature of about 100 to 170 ° C. Such a water vapor atmosphere is realized by using a pressure vessel. In the case of using a pressure vessel, the blank material 2 may be left softened in the pressure vessel having the water vapor atmosphere. Instead of softening the blank material 2 in a high-temperature and high-pressure steam atmosphere, the blank material 2 may be heated and softened by microwaves. Further, the blank material 2 may be boiled and softened.

  Thereafter, the softened blank 2 is compressed (step S3). In this step, the blank material 2 is deformed into a box shape different from that before the softening step by sandwiching the blank material 2 using a pair of molds in the same steam atmosphere as the softening step and applying a compressive force. When the blank material 2 is softened in the pressure vessel, the blank material 2 may be subsequently compressed in the pressure vessel.

  FIG. 5 is a diagram illustrating an outline of the compression process and a configuration of a main part of a mold used in the compression process. 6 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 5 and 6, the blank material 2 is sandwiched between a pair of concave mold 101 and convex mold 102, and a predetermined compression force is applied.

  The concave mold 101 that applies a compressive force from above the blank material 2 in the compression step includes a concave portion 111 having a smooth surface that comes into contact with the protruding outer surface of the blank material 2. The curvature radius of the surface of the portion curved from the main plate portion 21 to the first side plate portion 22a and facing the concave mold 101 is RO, and the curvature radius of the surface of the concave portion 111 in contact with this surface is RA. Then, the two radii of curvature RO and RA satisfy the relationship RO> RA.

  On the other hand, the convex mold 102 for applying a compressive force from the lower side of the blank material 2 in the compression step includes a convex portion 121 having a smooth surface that comes into contact with the concave inner surface of the blank material 2. Let RI be the curvature radius of the surface of the portion that curves from the main plate portion 21 to the side plate portion 22a and face the convex mold 102, and let RB be the curvature radius of the surface of the convex portion 121 that contacts this surface. The two radii of curvature RI and RB satisfy the relationship RI> RB.

  FIG. 7 is a view showing a state in which the blank material 2 is sandwiched between the concave mold 101 and the convex mold 102 and a predetermined pressure is applied in the compression step, and the deformation of the blank material 2 is almost completed. FIG. In the state shown in FIG. 7, the blank 2 receives the compressive force from the concave mold 101 and the convex mold 102, so that the concave mold 111 and the convex section 121 are in a state where the concave mold 101 and the convex mold 102 are closest to each other. Is deformed into a box shape different from that before the softening step. This gap shape is substantially similar to the shape obtained through the heating shaping step (step S6) described later.

  In the compression step described above, the side plate portion 22 is bent in a direction in which the angle rising from the main plate portion 21 increases after compression. At this time, a force is applied on the outer peripheral surface of the side plate portion 22 so as to tear the adjacently extending fibers, but the fibers in the blank material 2 are substantially in the thickness direction of the side plate portion 22 over almost the entire area of the side plate portion 22. Since they intersect, adjacent fibers are less likely to be torn compared to when the fibers are parallel to the thickness direction of the side plate portion. Therefore, in the blank material 2, there is little possibility of causing a crack in the compression process.

  After the compression process is completed, in a state where the blank material 2 is sandwiched between the concave mold 101 and the convex mold 102, a steam atmosphere at a higher temperature and pressure than the above-described water vapor atmosphere is applied to the concave mold 101 and the convex mold 102. The shape of the blank material 2 is fixed by forming it around (step S4). The steam atmosphere at this time has a pressure of about 0.6 to 3.4 MPa and a temperature of about 160 to 240 ° C., and is determined to be higher in temperature and pressure than the steam atmosphere in the compression step. When this immobilization process is performed in a pressure vessel, the pressure in the vessel in the softening step may be set to a value included in the above-described range.

  Subsequently, the concave mold 101, the convex mold 102, and the blank material 2 are discharged into the atmosphere, and the blank material 2 is dried (step S5). In this case, the drying of the blank material 2 may be promoted by separating the concave mold 101 and the convex mold 102. The thickness of the main plate portion 21 after the drying step is preferably about 20 to 50% of the thickness of the main plate portion 21 before the compression step. Here, if the blank material after a drying process is called the blank material 12, the blank material 12 may have a slight variation in thickness. Therefore, in the present embodiment, it is desirable that the minimum value of the thickness of the blank material 12 is set to be equal to or greater than the thickness in the shape after the heating shaping process described later.

  After the drying process, the blank material 12 is shaped into a shape substantially similar to the blank material 12 while being heated in the air (step S6). FIG. 8 is a diagram schematically showing an outline of this heat shaping step. In the heating shaping step, the blank material 12 is shaped by sandwiching the blank material 12 using a pair of the heating shaping concave mold 201 and the heating shaping convex mold 202.

  The heating shaping concave mold 201 located above the blank member 12 in FIG. 8 includes a concave portion 211 having a smooth surface that abuts the surface of the blank member 12 on the protruding side. On the other hand, the heating shaping convex mold 202 located below the blank member 12 in FIG. 8 includes a convex portion 221 having a smooth surface that comes into contact with the surface of the blank member 12 on the depressed side.

  As shown in FIG. 9, when the concave mold 201 for heat shaping and the convex mold 202 for heat shaping are clamped, the shape of the gap formed by the concave portion 211 and the convex portion 221 is obtained by heating and shaping the blank 12. It corresponds to the final shape to be obtained later. The volume of this final shape is smaller than the volume of the blank 12 by the amount reduced by the heat shaping process. It is desirable that the shape of the blank material 12 after the heat shaping process is the same as the final shape, but since there are individual differences between the individual blank materials 12, there may be some errors from the final shape.

  Heaters 203 and 204 for generating heat are provided inside the heating shaping concave mold 201 and the heating shaping convex mold 202, respectively. The heaters 203 and 204 are respectively connected to a control device 205 having a temperature control function. The heaters 203 and 204 generate heat under the control device 205, and respectively heat the heating shaping concave mold 201 and the heating shaping convex mold 202. Add. The control device 205 controls the mold temperature when the blank material 12 is sandwiched so as to be equal to or higher than the temperature at which the amorphous region of the wooden part is crystallized and lower than the thermal decomposition temperature of the wooden part.

  In this way, the control device 205 controls the mold temperature, so that the crystallization of the wood part proceeds during the heating shaping process and at the same time the density of the wood part further increases, so that the surface hardness of the wood part increases. As a result, a compressed wood product having no moisture absorption and excellent shape stability can be obtained.

  In addition, by subjecting the surface of the blank 12 to heat shaping in the atmosphere, substances contained in the cell walls of the woody part are extracted to the surface, and color and gloss are generated on the surface. As a result, a unique texture unique to wood can be created.

  By the way, while providing a shaping allowance on the outer surface of the blank 12 facing the concave portion 211 of the heating shaping concave mold 201, the shape of the convex portion 221 of the heating shaping convex mold 202 is shown in FIG. If it is made equal to the shape of the convex part 121 of 102, the tensile force which acts on the outer surface of the blank material 12 at the time of heat shaping can be suppressed as much as possible. Therefore, in this case, cracking of the surface of the blank 12 at the time of heat shaping can be more reliably prevented.

  FIG. 10 is a perspective view showing a configuration of a compressed wood product manufactured by the above-described compressed wood product manufacturing method. The compressed wooden product 3 shown in the figure corresponds to the main plate portion 21 of the blank 2, corresponds to the flat plate main plate portion 31 having a substantially rectangular main surface, and the side plate portion 22, and the main plate from the periphery of the main plate portion 31. And a side plate portion 32 that is curved and extends in an oblique direction with respect to the portion 31. The side plate portion 32 has a first side plate portion 32a and a second side plate portion 32b corresponding to the first side plate portion 22a and the second side plate portion 22b of the blank material 2, respectively. The compressed wood product 3 has a smaller volume than the blank material 2 before the compression step, and has a box shape different from that of the blank material 2.

  In addition, the fiber direction of the compressed wooden product 3 is substantially parallel to the main surface of the main plate portion 31 and intersects the substantially rectangular four sides forming the outer edge of the main surface on the main surface. As a result, appropriate strength is imparted to the first side plate portion 32a and the second side plate portion 32b. In order to provide the first side plate portion 32a and the second side plate portion 32b with similar strength, it is desirable that the intersecting angle is 30 degrees or more and 60 degrees or less.

  FIG. 11 is a perspective view illustrating a configuration of an exterior body of a digital camera that is an application example of the compressed wooden product 3. The exterior body 4 shown in the figure is an exterior body on the front side (the side facing the subject) of the digital camera, and includes a main plate portion 31 and a side plate portion 32 (first side plate portion 32a, second side plate portion) of the compressed wood product 3. 32b) includes a main plate portion 41 and side plate portions 42 (first side plate portion 42a and second side plate portion 42b). The main plate 41 has a cylindrical opening 411 that exposes the imaging unit of the digital camera, and a rectangular parallelepiped opening 412 that exposes the flash of the digital camera. The first side plate portion 42a has a semi-cylindrical cutout 421 that exposes the shutter button.

  FIG. 12 is a perspective view showing an external configuration of a digital camera whose front side is externally covered by the exterior body 4. A digital camera 301 shown in FIG. 1 includes an imaging unit 302, a flash 303, and a shutter button 304. The front side of the digital camera 301 where the imaging unit 302 and the flash 303 are exposed is covered by the exterior body 4. On the other hand, the back side of the digital camera 301 is covered with an exterior body 5 that is formed in the same manner as the exterior body 4 using the compressed wood product 3. Thus, when the compressed wood product according to the present embodiment is applied as an exterior body of a digital camera, it is preferable that the wall thickness is about 1.0 to 1.6 mm. In addition, RA and RB in FIG. 6 corresponding to the curvature radii on the outer peripheral side and the inner peripheral side of the curved portion of the final shape are more preferably 10 mm or less.

  According to the embodiment of the present invention described above, the flat main plate portion 21 having a substantially rectangular main surface, and the main plate portion 21 is curved and extends in an oblique direction with respect to the main plate portion 21 from the periphery. And a side plate portion 22 having an opening end surface that circulates, and the fiber direction L of the wood is substantially parallel to the main surface of the main plate portion 21 and forms the outer edge of the main surface on the main surface. Since the blank material 2 that intersects each of the substantially rectangular four sides (two long sides 21a and two short sides 21b) is compression-molded, the fibers extending adjacent to each other in the blank material 2 are bent during compression. It is difficult to peel off due to stress. Therefore, cracking does not occur when the box-shaped blank 2 having an opening is compression-molded, and appropriate strength can be imparted after molding.

  The compressed wood product according to the present invention may be chamfered instead of curving the boundary outer peripheral portion between the main plate portion and the side plate portion. In particular, when applied as an exterior body of a digital camera, the width of the chamfered portion is preferably 10 mm or less.

  The compressed wood product according to the present invention can also be applied as an exterior body for electronic equipment other than a digital camera. The compressed wood product according to the present invention is also applicable to tableware, various cases, building materials, and the like.

  Thus, the present invention can include various embodiments and the like not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. It is possible to apply.

DESCRIPTION OF SYMBOLS 1 Raw wood 2, 12 Blank material 3 Compressed wood product 4, 5 Exterior body 21, 31, 41 Main plate part 22, 32, 42 Side plate part 22a, 32a, 42a First side plate part 22b, 32b, 42b Second side plate part 101 Concave metal Mold 102 Convex mold 111, 211 Concave part 121, 221 Convex part 201 Concave mold for heating shaping 202 Convex mold for heating shaping 203, 204 Heater 205 Controller 301 Digital camera 302 Imaging part 303 Flash 304 Shutter button G Wood

Claims (8)

A compressed wood product manufacturing method for manufacturing a compressed wood product having a three-dimensional shape including a curved surface by compressing wood,
A box-shaped main plate portion having a substantially rectangular main surface, and a side plate portion having an opening end surface that extends from the periphery of the main plate portion so as to bend in an oblique direction with respect to the main plate portion. Forming a blank material in which the fiber direction of the wood is substantially parallel to the main surface of the main plate portion and intersects the substantially rectangular four sides forming the outer edge of the main surface on the main surface Process,
A softening step of softening the blank material formed in the blank material forming step;
A compression step of deforming the blank material softened in the softening step into a box shape having a smaller volume than the blank material before the softening step and different from the blank material before the softening step by applying a compressive force;
An immobilization step of immobilizing the shape of the blank material deformed by the compression step;
A method for producing a compressed wood product, comprising:   The said blank material WHEREIN: The angle which the substantially rectangular four sides in the fiber direction of the said wood and the main surface of the said main board part each cross | intersect on this main surface is 30 to 60 degree | times, It is characterized by the above-mentioned. A method for producing a compressed wood product according to 1. The immobilization step includes
The method for producing a compressed wood product according to claim 1 or 2, wherein the blank material is fixed in a steam atmosphere at a higher temperature and pressure than air. The compression step includes
The method for producing a compressed wood product according to claim 3, wherein a compressive force is applied to the blank material in a steam atmosphere at a temperature higher and higher pressure than the atmosphere and at a temperature lower and lower pressure than the steam atmosphere in which the fixing step is performed. The compression step includes
The method for producing a compressed wood product according to claim 4, wherein a compression force is applied by sandwiching the blank material by a pair of convex molds and concave molds. A compressed wood product manufactured by compressing wood and having a three-dimensional shape including a curved surface,
A box-shaped main plate portion having a substantially rectangular main surface, and a side plate portion having an opening end surface that extends from the periphery of the main plate portion so as to bend in an oblique direction with respect to the main plate portion. ,
A compressed wood product, characterized in that its own fiber direction is substantially parallel to the main surface of the main plate portion and intersects substantially four sides of the main surface on the main surface.   The compressed wood product according to claim 6, wherein an angle at which the fiber direction and four substantially rectangular sides of the main surface of the main plate portion intersect on the main surface is 30 degrees or more and 60 degrees or less.   The compressed wood product according to claim 6 or 7, wherein the compressed wood product is an exterior body for an electronic device for packaging an electronic device.

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